Hulk briefly wields all six Infinity Stones in the new gauntlet and screams in pain and is barely able to snap. It's also stated that he was the best fit for the gauntlet.

However

Stark later wields all 6 and while evidently in pain, is still able to snap with little effort and even says "I am Iron Man". While the snap does kill him, it doesn't seem like wielding them hurt him nearly as badly.

5 Answers
5

Hulk took longer and had more pain whilst wielding the Infinity Stones in the Infinity Gauntlet because he was trying to bring Nat back and undo the previous snap by Thanos. Below is the quote from memory so is most certainly incorrect.

Hulk: I tried to bring her back, I couldn’t.

Avengers: Endgame

However, Tony just removed the bad guys of Thanos and his team from 2014 so had less to do.

As we can see the affects of the snap on Hulk were less than they were on Tony who

Dies from it

Whereas Hulk merely has his arm hurt.

It’s also worth noting that Hulk has superhuman healing abilities and so has a higher chance of surviving the Stone’s powers as he would be more resilient that Stark who is a normal, albeit highly intelligent, human.

I guess that's fair. I thought when Hulk was hurt, it wasn't from what he was trying to do, it was because he had all six stones. It had the same burst of energy that went through Thanos in IW and that was what seemed to hurt Hulk. I might be wrong.
– GremerApr 28 at 16:26

9

Also recall that when Thanos used the stones early in Endgame, he was nearly killed by the power necessary for that use. It does seem that what one does with the stones is related to how much power is necessary to perform that act. While Hulk's universe-impacting act required far more power that Tony's field-of-battle impact, Hulk is far more resilient than Tony.
– RobApr 28 at 19:37

1

I'm not asking about why Tony died or anything like that, it's stated in the movie. But it seemed to me like just wearing the stones hurt both Thanos and Hulk. Why wasn't Tony hurt from wearing them?
– GremerApr 28 at 20:28

7

@Gremer If you're asking why Tony didn't suffer immediate consequences upon inserting the stones, I think it must be that his armor protected him. This is also why Tony doesn't experience the same immediate power surge Thanos and Hulk suffer. But he wasn't completely immune: slivers of light start to course through Tony just after he mounts the stones, and there is evidence of the type of skin damage Quill and other mortals suffer when handling a stone. Had he not snapped, I think there's on-screen evidence to suggest he would soon have been consumed by that power despite the armor.
– RobApr 28 at 23:12

2

@Rob Yes, that is exactly what I was trying to ask. Thank you. I guess the armor idea makes sense, but it seems odd given that the other gauntlets were made specifically for the stones. Maybe he saw what happened and his nanobots were stopping the surge or something.
– GremerApr 29 at 2:30

You may wish to read the comments on the other answer. OP isn’t asking about effects of using the stones, in which case Tony obviously has the worst effect. OP is asking about the affects of simply wearing the gauntlet and how that seems to hurt others more than Tony.
– Notts90Apr 30 at 20:06

The Stone's energy was a lot stronger and different than Thor's lightning though. Also when he absorbs Thor's lightning the armour specifically reshapes itself to absorb it whereas with the Stones it does not.
– TheLethalCarrotAug 12 at 11:16

Like what Hulk said in Endgame the cosmic energy from the Stones is mostly gamma and Hulk is gamma immune to a certain degree if not completely. However Tony is just a regular human being which is why he suffered greater consequences. Despite the difference in their usage of the Stones Tony died even though he did lesser with the Stones because ultimately he is a regular human. So doing virtually anything with all 6 would have killed him.